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CHARADRIIFORMES: Laridae
Gelochelidon nilotica
The bird on the right, Asaian race affinis of Gull-billed Tern, is noticeably smaller and has a shorter bill than the Australian race, macrotarsa.
Gull-billed Tern in flight
Gull-billed Tern
Breeding and Non-breeding Colours
Gull-billed Tern Asian Race affinis